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The Middle Arm Bridge is one of three transit bridges in
The Middle Arm Bridge is one of three transit bridges in Metro Vancouver
The Metro Vancouver Regional District (MVRD), or simply Metro Vancouver, is a Canadian political subdivision and Corporation, corporate entity representing the metropolitan area of Greater Vancouver, designated by provincial legislation as o ...
. It spans the middle arm of the Fraser River
The Fraser River () is the longest river within British Columbia, Canada, rising at Fraser Pass near Blackrock Mountain (Canada), Blackrock Mountain in the Rocky Mountains and flowing for , into the Strait of Georgia just south of the City of V ...
, linking Lulu Island
Lulu Island is the name of the largest island in the estuary of the Fraser River, located south of Vancouver, British Columbia, Canada, and the List of Canadian islands by population, second-most populous island in British Columbia, after Vancou ...
with the Vancouver International Airport
Vancouver International Airport is an international airport located on Sea Island (British Columbia), Sea Island in Richmond, British Columbia, Richmond, British Columbia, serving the city of Vancouver and the Lower Mainland region. It is lo ...
on Sea Island. It is used by the airport branch of the Canada Line
The Canada Line is a rapid transit line in Greater Vancouver, British Columbia, Canada, that is part of the SkyTrain (Vancouver), SkyTrain system. The line is owned by TransLink (British Columbia), TransLink and InTransitBC and is operated by SN ...
, which opened in August 2009.
The bridge is a box girder
A box girder or tubular girder (or box beam) is a girder that forms an enclosed tube with multiple walls, as opposed to an i-beam, - or H-beam. Originally constructed of wrought iron joined by riveting, they are now made of rolled steel, rolled ...
prestressed concrete
Prestressed concrete is a form of concrete used in construction. It is substantially prestressed (Compression (physics), compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service. Post-t ...
bridge, and is built using cost-efficient cantilever
A cantilever is a rigid structural element that extends horizontally and is unsupported at one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a cantilev ...
construction. The integrated arch
An arch is a curved vertical structure spanning an open space underneath it. Arches may support the load above them, or they may perform a purely decorative role. As a decorative element, the arch dates back to the 4th millennium BC, but stru ...
form is designed to appear minimal, while adequately supporting the weight of the trains that cross it.
The Moray Bridge, a swing bridge nearby, was also previously referred to as the Middle Arm Bridge.
See also
*List of bridges in Canada
This is a list of bridges and viaducts in Canada, including those for pedestrians and vehicular traffic.
Historical and architectural interest bridges
There are only a few covered bridges left in Canada. In Quebec, despite over 1,200 existing ...
* List of crossings of the Fraser River
References
Canada Line Railway bridges in British Columbia Bridges in Greater Vancouver Bridges over the Fraser River Transport in Richmond, British Columbia Buildings and structures in Richmond, British Columbia Rapid transit bridges Sea Island (British Columbia) {{BritishColumbia-transport-stub